The commercial use of biological control has seen a very fast development during the past 30 years. Currently, about 85 companies worldwide produce more than 125 species of natural enemies. The largest variety of commercially produced species of natural enemies is available in Europe, mainly as a result of a much larger greenhouse industry in Europe, although many species are also available in North America. Emerging markets are Latin America, Asia and (South) Africa. The most commonly sold natural enemies are discussed in this chapter. The recommended release rates, the unit of sale and the target pest(s) are specified. In addition, a list of the commercially available biocontrol agents is provided, together with the target pests and the year of first use.